Seems to me this is pretty related to the other article you just posted. When white people coopt black entertainment, we tend to make use of only those aspects which we find relatable, funny, etc., e.g. the possible interpretation of the Daquan meme as reinforcing white fears about black men.
As such, when 'black' entertainment is no longer in the hands of black people, it loses the ability to draw attention to important issues. Thoughtless consumption of the musical qualities of rap or hip-hop which gives rise to the erasure of distinctions between black artists and Iggy Azalea, and the erasure of the black consciousness as expressed through hip-hop.